HUKKA DESIGN Stone Set of 2 Ochoko (Sake Cups) I tried to use these after washing them with my home detergent, but I haven't had the opportunity to drink sake, so I haven't used them. There is no box, so I will pack them carefully to prevent breakage. Ochoko, Japanese sake, natural stone, Karelian soapstone, keeps temperature, stylish Nordic goods, Finland, heat retention/cold retention effect, sake glass, excellent water resistance